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Converging lines in photographs, particularly of buildings, forests and so on, can often detract from the desired effect. Architectural elements in photographs often have diagonal lines, but the mind thinks of buildings as having vertical and horizontal lines. Converging lines are caused by the film-plane being angled relative to the object of the photo, and that effect can be avoided optically by the use of either a shift lens (quite expensive) or the use of a medium or large-format view camera having swing features. With a shift lens, the lens itself is shifted perpendicularly to the z-axis, so that the film level can remain parallel to the subject. Shift lenses are mechanically and optically more complex than standard lenses, which is why they are comparatively expensive. Often, one is shooting with a "point and shoot" camera, where the option of changing lenses does not exist. The advent of digital photography or scanning existing photos from prints opens up new possibilities for manipulating the picture. Here is where ShiftN shows its strength.
ShiftN permits correction of converging lines; a majority of the correction work is taken over automatically by the program. Using the "automatic correction" item in the menu is in most cases sufficient to produce a satisfying result. Both the effects of converging lines and poor camera angle are corrected automatically.
The process in ShiftN is to search the image first for straight lines and edges, and to consider those which are sufficiently vertical to be likely architectural elements. On the basis of these straight line segments the program runs an optimization process that attempts to determine perspective, correcting the image so the lines are made parallel to each other.
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pitch shift
soft focus lens
luteal phase
shift patterns
lens flare
lunar phase
Random Shift Schedules
lens corrector
phase invert
Easy Shift Scheduling -------------------------
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ShiftN: http://www.marcus-hebel.de/foto/ShiftN_Setup.exe
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If during manufacturing of an audio soundtrack there is an analog stage (recording to a tape or to a gramophone disk in an analog mode), an inevitable consequence will be the appearance of a phase shift between stereo-channels. In an uncompressed soundtrack these distortions are inaudible but only become apparent when stored in a compressed format (for example in MP3 Joint Stereo). These distortions are heard as unpleasant high-frequency sounds.
Advanced audio corrector allows to remove the phase distortions in high-quality audio files (WAV, 16-bit Stereo) before coding to a format MP3. The program works in a batch mode.
Advanced Audio Corrector: http://www.rastervect.com/aacorr20.zip
Making Waves: http://www.LivingGraphs.com/common/products/mw/files/mw.msi
Making Waves is an interactive wave construction set that allows students to create and explore situations involving any number of transverse and longitudinal waves. This software takes an interactive, visual approach to physics. Making Waves will help students develop an intuition for wave interactions. Students will gain a better understanding of the physics behind the images. By creating and exploring their own waves and wave sums with Making Waves, students encounter the core concepts in formal wave theory.
Making Waves was designed for use in senior high school and college physics studies. The software offers interactive real-time simulation; editable wave properties including amplitude, wavelength, phase shift, speed, frequency and damping; standing waves; and mks units. Online help and tutorials are provided to help teachers integrate the software into their curriculum.
With Making Waves, students can now explore the interaction of waves using only their computer, Living Graph Paper and their imagination. |
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